JP2018131023A - Pressure decrease hindrance device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure decrease hindrance device that is able to hinder degradation in the function of a refrigeration cycle, resulting from outside-air cooling.SOLUTION: A capacitor 17 is provided in a refrigerant bypass passage 16 allowing communication between a passage upstream of a capacitor 11 and a passage downstream of it. Each of three-way valves 14, 15 is switchable a channel such that refrigerant discharged from a compressor 10 is bypassed, thereby flowing to the refrigerant bypass passage 16. A radiator 21 is able to heat outside air by heat exchange between outside air passing through it and cooling water for an engine 20. The capacitor 17 is installed downstream of the radiator 21 in a flowing direction of the outside air and, therefore, the capacitor is heated with the outside air. Accordingly, since a pressure decrease on a high-pressure side of a refrigeration cycle 1 can be hindered, a pressure difference between the high pressure side and a low pressure side can be ensured.SELECTED DRAWING: Figure 1

Description

  The disclosure in this specification relates to a pressure drop suppressing device in a refrigeration cycle mounted on a vehicle.

  Patent Document 1 discloses a capacitor that faces an air intake port provided in the front portion of a vehicle, and a radiator that is installed behind the capacitor. The capacitor is provided so as to close the radiator core in front of the radiator. The condenser is a member that is connected to the on-vehicle air conditioner by piping and cools the refrigerant circulating through the piping. The refrigerant, which has been compressed by the air conditioner compressor and heated up, exchanges heat with the outside air introduced through the air intake port in the condenser core provided in the condenser, and the latent heat of the refrigerant is released. The contents of the prior art documents listed as the prior art are incorporated by reference as an explanation of the technical elements in this specification.

JP2015-128923A

  According to the apparatus described in Patent Document 1, since the condenser is installed in front of the radiator, the condenser is cooled by the introduced outside air. As the condenser is cooled, the refrigerant pressure on the high pressure side of the refrigeration cycle decreases. Thereby, since the pressure difference between the high pressure side and the low pressure side in the refrigeration cycle is reduced, there is a problem that the refrigerant flow rate cannot be secured and the refrigeration cycle cannot exhibit a desired function.

  In view of such a problem, an object of the disclosure in this specification is to provide a pressure drop suppressing device capable of suppressing a function deterioration of a refrigeration cycle due to outside air cooling.

  A plurality of aspects disclosed in this specification adopt different technical means to achieve each purpose. In addition, the reference numerals in the parentheses described in the claims and in this section are examples showing the correspondence with the specific means described in the embodiments described later as one aspect, and limit the technical scope. is not.

One of the disclosed pressure drop suppression devices is a pressure drop suppression device related to a refrigeration cycle (1; 301) that constitutes a refrigerant circuit that is mounted on a vehicle and circulates refrigerant.
The compressor (10) that discharges the sucked refrigerant at an increased pressure, the first condenser (11) that exchanges heat between the refrigerant discharged from the compressor and the refrigerant and the outside air, and the refrigerant that flows out of the first condenser A decompressor (12) for decompressing, an evaporator (13) into which the refrigerant decompressed by the decompressor flows, and a passage upstream of the first capacitor so that the refrigerant discharged from the compressor can bypass the first capacitor A refrigerant bypass passage (16) communicating with the downstream passage, a second condenser (17; 17B) provided in the refrigerant bypass passage, a heating device (20, 21) for heating the second condenser, and a compressor A flow path switching device (14, 15) capable of switching the flow path so that the refrigerant discharged from the refrigerant bypass passage flows. Comprising a control device for controlling the operation of the road switching device (100), the.

  According to this pressure drop suppression device, the second condenser can be provided in the refrigerant bypass passage where the refrigerant discharged from the compressor can bypass the first condenser, and the second condenser can be heated by the heating device. As a result, when the first condenser is cooled by the outside air and the refrigerant pressure on the high-pressure side of the refrigeration cycle decreases and the refrigerant flow rate cannot be secured, the refrigerant flow is switched to the second condenser by the flow path switching device, and the heating device The second capacitor can be heated. According to this operation, since the pressure drop on the high pressure side in the refrigeration cycle can be suppressed, it is possible to provide a refrigeration cycle that can secure a pressure difference between the high pressure side and the low pressure side and exhibit a desired function. Therefore, it is possible to provide a pressure drop suppression device that can suppress a decrease in function of the refrigeration cycle due to outside air cooling.

One of the disclosed pressure drop suppression devices is a pressure drop suppression device related to a refrigeration cycle (201) that constitutes a refrigerant circuit that is mounted on a vehicle and circulates refrigerant,
The compressor (10) that discharges the sucked refrigerant at an increased pressure, the first condenser (11) that exchanges heat between the refrigerant discharged from the compressor and the refrigerant and the outside air, and the refrigerant that flows out of the first condenser A decompressor (12) for decompressing, an evaporator (13) into which the refrigerant decompressed by the decompressor flows, and a passage upstream of the first capacitor so that the refrigerant discharged from the compressor can bypass the first capacitor A refrigerant bypass passage (16) that communicates with the downstream passage, a second condenser (17A) provided in the refrigerant bypass passage, and a bypass state in which refrigerant discharged from the compressor flows into the refrigerant bypass passage A flow path switching device (14, 15) capable of switching the flow path, and a control device (100) for controlling the operation of the flow path switching device. The second capacitor, the amount of heat exchange is configured to be smaller than the first capacitor.

  According to this pressure drop suppression device, the second condenser is provided in the refrigerant bypass passage where the refrigerant discharged from the compressor can bypass the first condenser, and the heat exchange amount of the second condenser is smaller than that of the first condenser. . As a result, when the first condenser is cooled by the outside air and the refrigerant pressure on the high pressure side of the refrigeration cycle decreases and the refrigerant flow rate cannot be secured, the refrigerant is switched to flow through the second condenser instead of the first condenser. The amount of heat exchange between the outside air and the refrigerant can be reduced. According to this action, it is possible to provide a refrigeration cycle that can suppress a decrease in pressure on the high pressure side in the refrigeration cycle, ensure a pressure difference between the high pressure side and the low pressure side, and exhibit a desired function. Therefore, it is possible to provide a pressure drop suppression device that can suppress a decrease in function of the refrigeration cycle due to outside air cooling.

One of the disclosed pressure drop suppression devices is a pressure drop suppression device related to a refrigeration cycle (101) that is mounted on a vehicle and constitutes a refrigerant circuit in which a refrigerant circulates.
Compressor (10) that discharges the sucked refrigerant at an increased pressure, condenser (11) in which the refrigerant discharged from the compressor flows in and heat exchange between the refrigerant and the outside air, and a pressure reducing device that decompresses the refrigerant that has flowed out of the condenser (12), the evaporator (13) into which the refrigerant depressurized by the decompression device flows, and the cooling water circuit (102) in which the cooling water of the vehicle engine (20) circulates to exchange heat between the cooling water and the outside air. A first radiator (21) that cools the cooling water and is disposed downstream of the condenser in the flow direction of the outside air, and a passage upstream of the first radiator so that the cooling water can bypass the first radiator And a cooling water bypass passage (24) that communicates with the downstream passage, and is provided upstream of the condenser in the flow direction of the outside air. The second radiator (25), the flow path switching device (22, 23) capable of switching the flow path so that the cooling water flows into the cooling water bypass passage, and the operation of the flow path switching device. And a control device (100) for controlling.

  According to this pressure drop suppression device, the second radiator is provided in the cooling water bypass passage that can bypass the first radiator, and the condenser is provided on the downstream side of the outside air flow of the second radiator, so that the second radiator is heated. Heat exchange can be performed between the outside air and the refrigerant in the condenser. As a result, when the condenser is cooled by the outside air and the refrigerant pressure on the high pressure side of the refrigeration cycle decreases and the refrigerant flow rate cannot be secured, the flow path is switched so that the cooling water flows through the cooling water bypass passage. A decrease in the refrigerant pressure can be suppressed. According to this action, it is possible to provide a refrigeration cycle that can ensure a pressure difference between the high pressure side and the low pressure side in the refrigeration cycle and exhibit a desired function. Therefore, it is possible to provide a pressure drop suppression device that can suppress a decrease in function of the refrigeration cycle due to outside air cooling.

One of the disclosed pressure drop suppression devices is a pressure drop suppression device related to a refrigeration cycle (101) that is mounted on a vehicle and constitutes a refrigerant circuit in which a refrigerant circulates.
Compressor (10) that discharges the sucked refrigerant at an increased pressure, condenser (11) in which the refrigerant discharged from the compressor flows in and heat exchange between the refrigerant and the outside air, and a pressure reducing device that decompresses the refrigerant that has flowed out of the condenser (12), an evaporator (13) into which the refrigerant decompressed by the decompression device flows, a heater device (4) provided at a position where the condenser can be heated, and the operation of the heater device in a heat generation state and a non-heat generation state And a control device (100) for switching to

  According to this pressure drop suppression device, the capacitor can be heated by controlling the heater device to a heat generation state. As a result, when the condenser is cooled by the outside air and the refrigerant pressure on the high pressure side of the refrigeration cycle decreases and the refrigerant flow rate cannot be secured, the refrigerant pressure on the high pressure side of the refrigeration cycle is controlled by performing control to switch the heater device to the heat generation state. Can be suppressed. According to this action, it is possible to provide a refrigeration cycle that can ensure a pressure difference between the high pressure side and the low pressure side in the refrigeration cycle and exhibit a desired function. Therefore, it is possible to provide a pressure drop suppression device that can suppress a decrease in function of the refrigeration cycle due to outside air cooling.

It is drawing which shows the structure of the pressure drop suppression apparatus of 1st Embodiment. It is a flowchart explaining the action | operation of the pressure drop suppression apparatus and vehicle air conditioner which concern on 1st Embodiment. It is drawing which shows the structure of the refrigerating cycle of 2nd Embodiment. It is drawing which shows the structure of the refrigerating cycle of 3rd Embodiment. It is drawing which shows the structure of the refrigerating cycle of 4th Embodiment. It is drawing which shows the structure of the refrigerating cycle of 5th Embodiment. It is a block diagram which concerns on control of the pressure drop suppression apparatus of 6th Embodiment. It is a flowchart explaining the action | operation of the pressure drop suppression apparatus and vehicle air conditioner which concern on 6th Embodiment.

  Hereinafter, a plurality of modes for carrying out the present disclosure will be described with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration. Not only combinations of parts that clearly indicate that combinations are possible in each form, but also forms may be partially combined even if they are not clearly specified, as long as there is no problem with the combination. Is possible.

(First embodiment)
The pressure drop suppression device is a device that can suppress a pressure drop on the high-pressure side in a refrigeration cycle that constitutes a refrigerant circuit that is mounted on a vehicle and in which a refrigerant circulates. The pressure on the high pressure side is the pressure of the refrigerant in the refrigerant passage before decompression, corresponding to the period from the discharge part of the compressor 10 to the decompression device. In a vehicle to which this pressure drop suppression device is applied, the refrigerant passage before decompression is installed at a site where it can be cooled by outside air outside the vehicle. When the refrigerant passage before decompression is cooled by outside air, the refrigerant is cooled, the pressure on the high-pressure side in the refrigeration cycle 1 is reduced, and the low pressure corresponding to the high-pressure side and the decompression device to the suction portion of the compressor 10 The pressure difference from the side becomes smaller. Due to the reduction of the pressure difference, there arises a problem that the refrigeration cycle 1 cannot perform a desired function. The pressure drop suppression device provides an effect of suppressing the reduction in the pressure difference between the high pressure side and the low pressure side in the refrigeration cycle 1. The desired function here includes a cooling capacity, an air cooling rate, and the like that the refrigeration cycle 1 can exhibit when each cycle component operates normally.

  The pressure drop suppression device according to the first embodiment will be described with reference to FIGS. 1 and 2. The pressure drop suppression device of the first embodiment controls the operation of a refrigeration cycle 1 applied to a vehicle air conditioner, a cooling water circuit 2 through which cooling water of the engine 20 circulates, and a flow path switching device in the refrigeration cycle 1. And a control device 100. The cooling water circuit 2 includes a water jacket of the engine 20, a heat exchange core portion of the radiator 21, and piping that forms a passage that connects these in an annular shape. The cooling water circulates through the cooling water circuit 2 by the driving force of a pump built in the engine 20.

  The radiator 21 is a heat dissipating heat exchanger that cools the cooling water whose temperature has increased due to the operation of the engine 20, and is installed in the engine room at the rear of the grill at the front of the vehicle. A condenser 11 that is one of the components of the refrigeration cycle 1 is installed in front of the radiator 21. A blower is provided behind the radiator 21. In the heat exchange core portion, the radiator 21 promotes heat dissipation of the cooling water by exchanging heat between the outside air taken in from the outside of the vehicle by the blower and the cooling water.

  The refrigeration cycle 1 is a cycle in which refrigerant circulates in order to perform air conditioning in the passenger compartment. The refrigeration cycle 1 is configured such that a compressor 10, a condenser 11, a condenser 17, an expansion valve 12, an evaporator 13, and the like are provided in a refrigerant circuit constituted by an annular passage. Among the devices constituting the refrigeration cycle 1, the evaporator 13 is mounted on the air conditioning unit 3 provided in the space between the partition wall that partitions the engine room and the vehicle interior side space and the instrument panel. The evaporator 13 is provided so that the heat exchange core section traverses an air passage formed inside the air conditioning case 30 of the air conditioning unit 3.

  The compressor 10 is an electric fluid machine that is driven by an electric motor and compresses and discharges the refrigerant in the refrigeration cycle 1 to a high pressure. For example, the refrigerant discharge amount is adjusted according to the operating rotational speed. It has become. The operating rotation speed and refrigerant discharge amount of the compressor 10 are controlled by adjusting the power supplied from a battery or the like by an inverter. The power adjustment by the inverter is controlled by the control device 100.

  The condenser 11 is a heat exchanger that exchanges heat between the refrigerant discharged from the compressor 10 and flowing in. The expansion valve 12 is an example of a decompression device that decompresses the refrigerant flowing out of the condenser 11. The expansion valve 12 may be a fixed throttle portion in which the passage opening degree is fixed, or may be configured such that the throttle opening degree is controlled by the control device 100. The evaporator 13 is a heat exchanger that performs heat exchange between the refrigerant decompressed by the expansion valve 12 and the air flowing through the air passage of the air conditioning case 30 to cool and air-condition the air. The refrigerant evaporated by the evaporator 13 is sucked into the compressor 10.

  In addition, a blower 31 that blows air upstream of the evaporator 13 is provided inside the air conditioning case 30, and a heater core is provided downstream of the evaporator 13. The air taken in from the outside of the vehicle or the vehicle interior by the blower 31 is temperature-adjusted by the evaporator 13 and the heater core while flowing through the air passage in the air conditioning case 30 and then supplied to the vehicle interior according to the set blowing mode. The

  The refrigerant bypass passage 16 constitutes a passage that bypasses the capacitor 11 in the refrigerant circuit of the refrigeration cycle 1. The refrigeration cycle 1 includes at least two capacitors. The capacitor 11 is a first capacitor, and the capacitor 17 is a second capacitor as a sub capacitor. A condenser 17 is provided in the refrigerant bypass passage 16. The refrigerant bypass passage 16 is provided in parallel with the capacitor 11 so as to branch from the refrigerant circuit on the inlet side of the capacitor 11 and join the refrigerant circuit on the outlet side of the capacitor 11. Therefore, the capacitor 11 and the capacitor 17 are connected in parallel in the refrigerant circuit.

  A three-way valve 14 is installed on the upstream side and a three-way valve 15 is installed on the downstream side at the branch portion where the refrigerant bypass passage 16 branches from the refrigerant circuit. The three-way valve 14 and the three-way valve 15 are an example of a flow path switching device that switches the refrigerant flow path in the refrigeration cycle 1 to the condenser 11 side or the condenser 17 side. The three-way valve 14 and the three-way valve 15 open the condenser 11 by an internal valve and close the refrigerant bypass passage 16 to close the refrigerant bypass passage 16 and open the refrigerant bypass passage 16 and close the condenser 11 side. The flow path switching device can be switched between when the refrigerant flows through the condenser 17. The three-way valve 14 and the three-way valve 15 are flow path switching devices that can switch the flow path so that the refrigerant discharged from the compressor 10 flows into the refrigerant bypass passage 16.

  Opening and closing of the valves inside each of the three-way valve 14 and the three-way valve 15 is controlled by the control device 100. The opening degree of the valve is variably controlled by the control device 100. By controlling the opening of the valve, the ratio of the refrigerant flow rate through the capacitor 11 and the refrigerant flow rate through the capacitor 17 can also be controlled. The control device 100 controls the opening degree of the valve so that, for example, when the detected temperature of the temperature sensor that detects the outside air temperature is lower than a predetermined threshold, the refrigerant passes through the refrigerant bypass passage 16, and the detected temperature is equal to or higher than the threshold. In this case, control is performed so that the amount of refrigerant passing through the capacitor 11 is increased. The temperature information detected by the temperature sensor is output to the control device 100.

  With the above configuration, when the compressor 10 is operated in the refrigeration cycle 1, the refrigerant passes through at least one of the capacitor 11 and the capacitor 17 according to the operating state of the three-way valves 14 and 15, and passes through the expansion valve 12 and the evaporator 13. Then, it is sucked into the compressor 10. When circulating through the evaporator 13, the refrigerant evaporates and absorbs heat from the blown air to provide cooling air to the vehicle interior.

  The control device 100 includes a microcomputer that includes functions such as a CPU (central processing unit) that performs arithmetic processing and control processing, a memory such as a ROM and a RAM, and an I / O port (input / output circuit). ing. The control device 100 includes an input circuit through which signals from various sensors, signals from an operation unit for air conditioning operation that commands operation of the vehicle air conditioner, and the like are input via the air conditioning ECU or not via the air conditioning ECU. Prepare. The operation unit is, for example, a switch on the operation panel that is integrally installed on an instrument panel or the like.

  The control device 100 controls the operation of the three-way valve 14 and the three-way valve 15 according to the temperature detected by the temperature sensor that detects the outside air temperature. The control device 100 includes a determination unit that performs predetermined calculation and determination using information based on a signal related to the detected temperature input to the input unit and a calculation program. The control device 100 includes an operation control unit that controls the opening positions of the three-way valve 14 and the three-way valve 15 according to the determination result by the determination unit.

  Next, the operation of the pressure drop suppression device and the vehicle air conditioner will be described with reference to the flowchart of FIG. The control process according to the flowchart shown in FIG. 3 is executed by the control device 100 and the air conditioning ECU. When the vehicle air conditioner is activated and enters an operation state, processing according to the flowchart of FIG. 3 is started. The process according to the flowchart of FIG. 3 is repeatedly executed in the operating state of the vehicle air conditioner.

  In step S10, the control device 100 determines whether or not a condition for high pressure reduction suppression control is satisfied. This determination process determines whether or not it can be assumed that the pressure at the high-pressure side portion of the refrigeration cycle 1 decreases and the refrigeration cycle 1 cannot perform a desired function due to a reduction in the pressure difference between the high-pressure side and the low-pressure side. This is a process for determining. For example, the determination unit of the control device 100 determines whether or not the outside air temperature detected by the temperature sensor is lower than a predetermined threshold temperature. This threshold temperature is set to a temperature included in a range of 0 ° C. or more and 6 ° C. or less, for example. When the detected outside air temperature is lower than the threshold temperature, it is determined that the condition for executing the high pressure reduction suppression control is satisfied. When the detected temperature is equal to or higher than the threshold temperature, the condition for executing the high pressure reduction suppression control is satisfied. Judge that it is not.

  Further, in step S10, it may be determined whether or not the high-pressure side refrigerant pressure in the refrigerant passage before decompression corresponding to the period from the discharge unit of the compressor 10 to the decompression device falls below a predetermined threshold pressure. The predetermined threshold pressure, which is a criterion for determining whether or not it is highly necessary to perform high-pressure drop suppression control, is set with high accuracy theoretically and experimentally by using the actual refrigerant pressure as a parameter for determination. It becomes possible to do. As the high-pressure side refrigerant pressure, for example, a detection value of a discharge pressure sensor that detects the refrigerant pressure discharged from the compressor 10 can be used. When the detected discharge pressure is lower than the threshold pressure, it is determined that the condition for executing the high pressure reduction suppression control is satisfied, and when the detected discharge pressure is equal to or higher than the threshold pressure, the condition for executing the high pressure reduction suppression control is satisfied. Judge that it is not.

  Further, in step S10, it may be determined whether or not the high-pressure side refrigerant temperature in the refrigerant passage before decompression corresponding to the period from the discharge unit of the compressor 10 to the decompression device is lower than a predetermined refrigerant threshold temperature. . Since the refrigerant temperature has a correlation with the refrigerant pressure, the refrigerant threshold temperature can be set using this characteristic. As the refrigerant temperature on the high pressure side, for example, a detection value of a discharge temperature sensor that detects the temperature of the refrigerant discharged from the compressor 10 can be used. When the detected discharge temperature is lower than the refrigerant threshold temperature, it is determined that the condition for executing the high-pressure decrease suppression control is satisfied, and when the detected discharge temperature is equal to or higher than the refrigerant threshold temperature, the condition for executing the high-pressure decrease suppression control is It is determined that it is not established.

  If it is determined in step S10 that the execution condition of the high pressure reduction suppression control is not satisfied, the process proceeds to step S30, the normal air conditioning control is executed, and the process returns to step S10 again. Normal air conditioning control is executed by the air conditioning ECU. The normal air conditioning control is, for example, an automatic air conditioning operation that realizes a target blowing temperature determined so as to bring the passenger compartment closer to a set temperature. The air conditioning ECU performs various calculations and processes using detection signals from various sensors and an air conditioning control program, and sends control signals to the actuators for each mode door, the motor drive circuit of the blower motor of the blower 31, the voltage control of the compressor 10, and the like. Output.

  When it is determined in step S10 that the execution condition for the high pressure reduction suppression control is satisfied, the process proceeds to step S20, where the high pressure reduction suppression control is executed, and the process returns to step S10 again. Therefore, step S20 is continuously executed while the execution condition of the high pressure reduction suppression control is satisfied. When the execution condition of the high pressure drop suppression control is satisfied, the condenser 11 is cooled by the outside air and is supercooled, and the state where the high pressure side pressure of the refrigeration cycle 1 is expected to drop or the high pressure side pressure is It is in a lowered state.

  The high pressure reduction suppression control is performed by controlling the opening degree of the three-way valve 14 and the three-way valve 15 by the control device 100 so that the refrigerant bypass passage 16 side is opened and the condenser 11 side is closed. By this processing, the high-pressure refrigerant discharged from the compressor 10 flows through the refrigerant bypass passage 16, so that it bypasses the condenser 11 and flows through the condenser 17. The refrigerant flowing through the condenser 17 exchanges heat with the outside air heated by the radiator 21 through heat exchange with the cooling water. By this action, the refrigerant flowing through the capacitor 17 can exchange heat with the outside air having a temperature higher than that of the outside air that exchanges heat when the refrigerant flows through the capacitor 11. Accordingly, the refrigerant flowing through the capacitor 17 has a higher temperature than the refrigerant flowing through the capacitor 11 in normal air conditioning control, and the decrease in refrigerant pressure on the high pressure side can be suppressed by the control in step S20. The pressure difference on the low pressure side can be maintained above a certain level. According to the process according to the flowchart of FIG. 3, even when the outside air temperature is low, the function deterioration of the refrigeration cycle 1 can be suppressed.

  Next, the effect which the pressure drop suppression apparatus of 1st Embodiment brings is demonstrated. The pressure drop suppression device includes a refrigerant circuit that connects the compressor 10, the first capacitor, the expansion valve 12, and the evaporator 13 in a ring shape. The pressure drop suppression device includes a refrigerant bypass passage 16 that connects a passage upstream and a passage downstream of the first capacitor, and a second capacitor provided in the refrigerant bypass passage 16. The pressure drop suppression device includes a heating device that heats the second condenser, a flow path switching device that can switch the flow path so that the refrigerant discharged from the compressor 10 flows into the refrigerant bypass passage 16, and a flow path And a control device 100 that controls the operation of the switching device.

  According to this pressure drop suppression device, the second condenser provided in the refrigerant bypass passage 16 where the refrigerant can bypass the first condenser can be heated by the heating device. As a result, when the first condenser is cooled by the outside air and the refrigerant pressure on the high pressure side of the refrigeration cycle 1 decreases and the refrigerant flow rate cannot be ensured, the refrigerant flow bypasses the first condenser and switches to the refrigerant flow flowing through the second condenser. Furthermore, a 2nd capacitor | condenser can be heated with a heating apparatus. According to this action, since the pressure drop on the high-pressure side in the refrigeration cycle 1 can be suppressed, the pressure difference between the high-pressure side and the low-pressure side can be ensured, and the refrigeration cycle 1 that can exhibit the expected function is provided. it can. Therefore, it is possible to provide a pressure drop suppressing device that can suppress a decrease in the function of the refrigeration cycle 1 due to outside air cooling.

  In particular, when the inside air mode in which the air in the passenger compartment is circulated when the refrigeration cycle is used for vehicle air conditioning, window fogging easily occurs. In this situation, if the first condenser is excessively cooled by the outside air, the temperature of the air passing through the evaporator 13 is hardly lowered, and the dehumidifying capacity of the air conditioner is lowered, so that the humidity in the passenger compartment is not lowered. For this reason, the possibility that window fogging occurs is further increased. Therefore, according to the pressure drop suppressing device of the first embodiment, the pressure drop on the high pressure side due to the outside air cooling can be suppressed, so that the risk of window fogging in the inside air mode can be reduced.

  The heating device is configured by a radiator 21 that radiates heat from the cooling water by exchanging heat between the passing outside air and the cooling water of the engine 20 of the vehicle. The second condenser is installed on the downstream side of the radiator 21 in the flow direction of the outside air. According to this configuration, since the outside air heated by the cooling water in the radiator 21 can be brought into contact with the second condenser, the high-pressure side refrigerant flowing through the second condenser can be warmed, and the refrigerant pressure on the high-pressure side can be increased. An apparatus for suppressing the decrease can be provided.

  The control device 100 switches the operation of the flow path switching device so as to be in a bypass state when the outside air temperature is lower than the threshold temperature (step S10, step S20). According to this control, when the refrigerant pressure on the high-pressure side is lowered to a level at which the refrigerant pressure on the high-pressure side can be assumed to fall to a level at which the refrigeration cycle 1 cannot perform its function, the process for suppressing the refrigerant pressure drop is reliably performed. be able to.

  The control device 100 switches the operation of the flow path switching device to the bypass state when the high-pressure side refrigerant pressure in the refrigeration cycle 1 is lower than the threshold pressure (step S10, step S20). According to this control, it is possible to directly detect the case where the refrigerant pressure on the high-pressure side has decreased to a level at which the refrigeration cycle 1 cannot perform its function, so that the processing for suppressing the decrease in the refrigerant pressure is reliably performed. Can do.

(Second Embodiment)
In the second embodiment, a pressure drop suppressing device according to another embodiment of the first embodiment will be described with reference to FIG. In the second embodiment, the same configuration as that of the first embodiment is described with the same reference numerals in FIG. In the second embodiment, contents different from the first embodiment will be described.

  As shown in FIG. 3, the pressure drop suppression device of the second embodiment includes a heater device 4 that heats the capacitor 11. The refrigeration cycle 101 includes a compressor circuit, a condenser 11, a condenser 17, an expansion valve 12, an evaporator 13, and the like provided in a refrigerant circuit constituted by an annular passage, and does not include the condenser 17 or the refrigerant bypass passage 16. . The heater device 4 is a device having a heating element that radiates heat around it, and is switched between a heat generation state in which heat is generated by the control device 100 and a non-heat generation state in which heat is not generated. As the heater device 4, for example, various electric heaters that generate heat when energized can be used. The heater device 4 is provided such that the heat generating portion faces the heat exchange core portion of the capacitor 11. Furthermore, it is preferable that the heater device 4 is provided on the upstream side of the outside air flow with respect to the condenser 11. According to this configuration, the outside air blown to the condenser 11 can be warmed by the heater device 4, and the condenser 11 can be prevented from being cooled by the low temperature outside air.

  The pressure drop suppression device of the second embodiment includes a heater device 4 provided at a position where the condenser 11 in the refrigeration cycle 101 can be heated, and a control device 100 that switches the operation of the heater device 4 between a heat generation state and a non-heat generation state. . According to this configuration, the capacitor 11 can be heated by controlling the heater device 4 to a heat generation state. Thus, when the condenser 11 is cooled by the outside air and the refrigerant pressure on the high pressure side of the refrigeration cycle 101 decreases and the refrigerant flow rate cannot be secured, the heater device 4 is controlled to be in a heat generation state, whereby the high pressure of the refrigeration cycle 101 is controlled. A decrease in the refrigerant pressure on the side can be suppressed. According to this action, it is possible to provide the refrigeration cycle 101 that can ensure a pressure difference between the high-pressure side and the low-pressure side in the refrigeration cycle 101 and exhibit a desired function. Therefore, it is possible to provide a pressure drop suppression device that can suppress a decrease in function of the refrigeration cycle 101 due to outside air cooling.

(Third embodiment)
In the third embodiment, a pressure drop suppressing device which is another embodiment of the first embodiment will be described with reference to FIG. In 3rd Embodiment, the structure similar to 1st Embodiment and 2nd Embodiment describes the same code | symbol in FIG. 4, and there exists the same effect. In the third embodiment, contents different from the above-described embodiment will be described.

  As shown in FIG. 4, the pressure drop suppression device of the third embodiment includes a second radiator installed on the upstream side of the outside air flow with respect to the condenser 11, and is configured to heat the condenser 11. The pressure drop suppression device of the third embodiment includes the refrigeration cycle 101 applied to the vehicle air conditioner, the cooling water circuit 102 through which the cooling water of the engine 20 circulates, and the operation of the flow path switching device in the cooling water circuit 102. And a control device 100 for controlling. The cooling water circuit 102 includes a water jacket of the engine 20, a heat exchange core portion of the radiator 21, and piping constituting a passage that connects these in an annular shape, and the cooling water bypass passage 24 is connected to the annular passage. ing. The cooling water circulates through the cooling water circuit 102 by the driving force of a pump built in the engine 20.

  The cooling water bypass passage 24 constitutes a passage that bypasses the radiator 21 in the circulation passage constituting the cooling water circuit 102. The cooling water bypass passage 24 is provided in parallel with the radiator 21 so as to branch from the circulation passage on the inlet side of the radiator 21 and join the circulation passage on the outlet side of the radiator 21. A sub radiator 25 is provided in the cooling water bypass passage 24. The cooling water circuit 102 includes at least two radiators. The radiator 21 is a main first radiator, and the sub-radiator 25 is a second radiator having a smaller heat exchange amount and heat exchange capacity than the first radiator. The radiator 21 and the sub radiator 25 are connected in parallel in the cooling water circuit 102.

  A three-way valve 22 is installed on the upstream side and a three-way valve 23 is installed on the downstream side at the branch portion where the cooling water bypass passage 24 branches from the cooling water circuit 102. The three-way valve 22 and the three-way valve 23 are an example of a flow path switching device that switches the flow path of the cooling water in the cooling water circuit 102 to the radiator 21 side or the sub-radiator 25 side. The three-way valve 22 and the three-way valve 23 open the radiator 21 side by an internal valve and close the cooling water bypass passage 24 side to open the cooling water bypass passage 24 side and the radiator 21 side when the cooling water flows through the radiator 21. The flow path switching device can be switched between when the cooling water flows through the radiator 21 by closing. The three-way valve 22 and the three-way valve 23 are flow path switching devices capable of switching the flow path so that the cooling water flowing out from the engine 20 flows into the cooling water bypass passage 24.

  Opening and closing of the valves inside the three-way valve 22 and the three-way valve 23 is controlled by the control device 100. The opening degree of the valve is variably controlled by the control device 100, and the ratio of the cooling water flow rate passing through the radiator 21 and the cooling water flow rate passing through the sub radiator 25 can be controlled by controlling the opening degree of the valve. The control device 100 controls the opening degree of the valve so that the cooling water passes through the cooling water bypass passage 24 when the detected temperature of the temperature sensor that detects the outside air temperature is lower than a predetermined threshold, for example. In the above case, control is performed so that the amount of cooling water passing through the radiator 21 is increased. The temperature information detected by the temperature sensor is output to the control device 100. For the three-way valve 22 and the three-way valve 23, a thermostat type in which the opening degree of the internal valve changes according to the outside air temperature may be used.

  The high pressure reduction suppression control is performed by controlling the opening degree of the three-way valve 22 and the three-way valve 23 by the control device 100 so that the cooling water bypass passage 24 side is opened and the radiator 21 side is closed. As a result of this processing, the cooling water that has flowed out of the engine 20 flows through the cooling water bypass passage 24, so that it bypasses the radiator 21 and flows through the sub-radiator 25. The refrigerant flowing through the condenser 11 exchanges heat with the outside air heated by exchanging heat with the cooling water in the sub radiator 25. By this action, the refrigerant flowing through the condenser 11 can exchange heat with the outside air whose temperature has risen compared to the case where the cooling water flows through the radiator 21. Therefore, the refrigerant that circulates in the capacitor 11 during the high pressure reduction suppression control has a higher temperature than the refrigerant that circulates in the capacitor 11 in normal air conditioning control. The decrease can be suppressed, and the pressure difference between the high pressure side and the low pressure side can be maintained above a certain level. Also in the third embodiment, even when the outside air temperature is low, the function deterioration of the refrigeration cycle 101 can be suppressed.

  The pressure drop suppression device of the third embodiment includes a radiator 21 installed downstream of the condenser 11 in the cooling water circuit 102 in the flow direction of outside air, a passage upstream of the radiator 21, and a downstream passage. Are provided with a cooling water bypass passage 24 and a sub-radiator 25. The sub-radiator 25 is provided in the cooling water bypass passage 24 and is disposed upstream of the condenser 11 in the flow direction of the outside air. The pressure drop suppression device includes a flow path switching device that can switch the flow path so that the cooling water enters a bypass state in which the cooling water flows into the cooling water bypass passage 24, and a control device 100 that controls the operation of the flow path switching device. .

  According to this pressure drop suppression device, heat can be exchanged between the outside air heated by the sub-radiator 25 and the refrigerant in the condenser 11. Thereby, when the condenser 11 is cooled by the outside air and the refrigerant pressure on the high-pressure side of the refrigeration cycle 101 decreases and the refrigerant flow rate cannot be secured, the flow path is switched so that the cooling water flows through the cooling water bypass passage 24. A decrease in the refrigerant pressure on the high pressure side can be suppressed. According to this action, it is possible to provide the refrigeration cycle 101 that can ensure a pressure difference between the high-pressure side and the low-pressure side in the refrigeration cycle 101 and exhibit a desired function.

(Fourth embodiment)
In the fourth embodiment, a pressure drop suppressing device which is another embodiment of the first embodiment will be described with reference to FIG. In 4th Embodiment, the structure similar to 1st Embodiment describes the same code | symbol in FIG. 5, and there exists the same effect. In the fourth embodiment, contents different from the above-described embodiment will be described.

  As shown in FIG. 5, the pressure drop suppression device of the fourth embodiment is a heat exchange amount of the second condenser provided in the refrigerant bypass passage 16 of the refrigeration cycle 201 with respect to the pressure drop suppression device of the first embodiment. Alternatively, the heat exchange capability is different from that of the first capacitor. The refrigeration cycle 201 includes a sub capacitor 17A as a second capacitor. The sub-capacitor 17 </ b> A may be configured on the upstream side in the flow direction of the outside air with respect to the radiator 21 or may be configured on the downstream side. The sub-capacitor 17 </ b> A can be configured such that the heat exchange amount or the heat exchange capacity is smaller than that of the capacitor 11 by configuring the sub-capacitor 17 </ b> A so that the pressure loss of the refrigerant flow path in the heat exchange core portion is higher than that of the capacitor 11. . Further, the sub-capacitor 17A is configured such that, for example, the surface area in contact with the outside air in the heat exchange core portion is smaller than that of the capacitor 11, so that the heat exchange amount or heat exchange capacity is smaller than that of the capacitor 11. it can.

  According to the pressure drop suppression device of the fourth embodiment, when the first condenser is cooled by the outside air and the refrigerant pressure on the high pressure side of the refrigeration cycle 201 is lowered and the refrigerant flow rate cannot be secured, the first condenser is bypassed. It can switch to the refrigerant | coolant flow which flows into a 2nd capacitor | condenser. According to this action, heat exchange with the outside air is reduced in the second condenser, so that a pressure drop on the high pressure side in the refrigeration cycle 201 can be suppressed. Therefore, the pressure difference between the high pressure side and the low pressure side can be ensured, and the refrigeration cycle 201 capable of exhibiting a desired function assumed can be provided.

(Fifth embodiment)
In the fifth embodiment, a pressure drop suppressing device according to another embodiment of the first embodiment will be described with reference to FIG. In the fifth embodiment, the same configuration as that of the first embodiment is described with the same reference numerals in FIG. In the fifth embodiment, contents different from the above-described embodiment will be described.

  As shown in FIG. 6, the pressure drop suppression device of the fifth embodiment is different from the engine 20 in that the capacitor 17B provided in the refrigerant bypass passage 16A of the refrigeration cycle 301 is replaced with the pressure drop suppression device of the first embodiment. The point which installs in the downstream with respect to the flow direction of outside air is different. The refrigerant bypass passage 16A is a passage corresponding to the refrigerant bypass passage 16 of the first embodiment. According to this configuration, the heating device that heats the capacitor 17 </ b> B as the second capacitor is configured by the vehicle engine 20.

  According to the pressure drop suppression device of the fifth embodiment, when the first condenser is cooled by the outside air and the refrigerant pressure on the high-pressure side of the refrigeration cycle 301 is lowered and the refrigerant flow rate cannot be secured, the first condenser is bypassed. It can switch to the refrigerant | coolant flow which flows into a 2nd capacitor | condenser. According to this action, since the outside air heated by the engine 20 can be heat-exchanged with the refrigerant in the second condenser, a pressure drop on the high-pressure side in the refrigeration cycle 301 can be suppressed. Therefore, the pressure difference between the high pressure side and the low pressure side can be ensured, and the refrigeration cycle 301 that can exhibit the desired function assumed can be provided.

(Sixth embodiment)
In the sixth embodiment, cooperation between the pressure drop suppression device and the vehicle air conditioner 5 in each of the above-described embodiments will be described with reference to FIGS. 7 and 8. In the sixth embodiment, the same configurations as those of the respective embodiments are described with the same reference numerals in the drawings, and have the same effects. In the sixth embodiment, contents different from the above-described embodiment will be described.

  As shown in FIG. 7, the control device 100 is configured to be communicable with an air conditioning ECU 50 that controls the operation of the vehicle air conditioner 5, and acquires information related to the operation state of the vehicle air conditioner 5 such as the blowing mode and the suction mode. can do. The air conditioning ECU 50 receives a signal from an operation unit that can be operated by a passenger. The occupant can transmit a signal for performing an automatic air conditioning operation to the air conditioning ECU 50 by operating the operation unit. The occupant can set the set temperature in the passenger compartment by operating the operation unit.

  The air conditioning ECU 50 includes various signals related to air conditioning control, for example, each detection signal of a sensor group for air conditioning control such as an inside air sensor, an outside air sensor, a solar radiation sensor, a discharge temperature sensor, a discharge pressure sensor, an evaporator temperature sensor, and automatic operation. A signal of the set temperature at is input. The air conditioning ECU 50 performs various calculations and processes using these detection signals and the air conditioning control program, and outputs control signals to the actuator for each mode door, the motor drive circuit of the blower motor of the blower 31, the voltage control of the compressor 10, etc. can do.

  The operation of the pressure drop suppression device and the vehicle air conditioner 5 will be described with reference to the flowchart of FIG. The control process according to the flowchart shown in FIG. 8 is executed by the control device 100 and the air conditioning ECU 50. When the vehicle air conditioner 5 is activated and enters an operation state, the processing according to the flowchart of FIG. 8 is started. The process according to the flowchart of FIG. 8 is repeatedly executed in the operating state of the vehicle air conditioner 5.

  In step S100, the control device 100 determines whether or not the current air intake mode in the vehicle air conditioner 5 is the inside air mode. If it is determined in step S100 that the mode is not the inside air mode, the process proceeds to step S130 in which control similar to that in step S30 of the first embodiment is performed, normal air conditioning control is performed, and the process returns to step S100 again. If it is determined in step S100 that the mode is the inside air mode, the process proceeds to step S110, and it is determined whether or not the execution condition of the high pressure reduction suppression control is satisfied. In steps S110 and S120 in the flowchart of FIG. 8, the same processes as in steps S10 and S20 of the first embodiment are performed, respectively.

  Thus, in the inside air mode, when the execution condition of the high-pressure drop suppression control is satisfied, the above-described high-pressure drop suppression control is performed, so that the humidity increases due to occupant expiration, heat release from the occupant, or the like. A decrease in the ability to dehumidify indoor air can be suppressed. In other words, the inside air mode for circulating the air in the passenger compartment is more likely to cause window fogging than the outside air mode, but by performing high pressure reduction suppression control, it is possible to ensure the dehumidifying capacity and to suppress the occurrence of window fogging. can get.

(Other embodiments)
The disclosure of this specification is not limited to the illustrated embodiments. The disclosure encompasses the illustrated embodiments and variations by those skilled in the art based thereon. For example, the disclosure is not limited to the combination of components and elements shown in the embodiments, and various modifications can be made. The disclosure can be implemented in various combinations. The disclosure may have additional parts that can be added to the embodiments. The disclosure includes those in which the components and elements of the embodiment are omitted. The disclosure encompasses parts, element replacements, or combinations between one embodiment and another. The technical scope disclosed is not limited to the description of the embodiments. The technical scope disclosed is indicated by the description of the scope of claims, and should be understood to include all modifications within the meaning and scope equivalent to the description of the scope of claims.

  In the above-described embodiment, whether or not the control device 100 is in a state where it can be assumed that the refrigeration cycle 1 cannot perform a desired function due to a pressure drop in the high-pressure side part in step S10 of FIG. 3 or step S110 of FIG. However, the present invention is not limited to such a processing form. For example, the control device 100 may perform a process of determining whether or not the state in which the refrigeration cycle 1 has failed to perform a desired function is detected in step S10 of FIG. 3 or step S110 of FIG. That is, in step S10 in FIG. 3 and step S110 in FIG. 8, it may be determined whether or not the fact that the refrigeration cycle 1 has failed to perform a desired function has been confirmed.

  In the above-described embodiment, the control device 100 is an electronic control device that controls the operating states of the three-way valve 14 and the three-way valve 15, but the control device in the claims is not limited to such a form. In the control device of the claims, the flow path switching device itself such as the three-way valve 14 and the three-way valve 15 is provided in accordance with predetermined parameters such as a pressure state relating to the refrigerant, a temperature state relating to the refrigerant, and an outside air temperature. In addition, a configuration including a configuration that automatically switches between normal air-conditioning control and high-pressure drop suppression control is also included. For the three-way valve 14 and the three-way valve 15, a thermostat type in which the opening degree of the internal valve changes according to the outside air temperature may be used.

  The control process described with reference to the flowcharts in the above-described embodiment is executed by the control device 100 and the air conditioning ECU in cooperation, but may be configured such that the air conditioning ECU executes all the processes. Moreover, the control apparatus 100 may be comprised as a part of air-conditioning control apparatus which controls the action | operation of each air-conditioning apparatus, or integral with air-conditioning ECU, for example.

DESCRIPTION OF SYMBOLS 1,101,201,301 ... Refrigeration cycle, 4 ... Heater apparatus 10 ... Compressor, 11 ... Condenser (1st capacitor | condenser)
DESCRIPTION OF SYMBOLS 12 ... Expansion valve (pressure reduction device) 13 ... Evaporator 14, 15 ... Three-way valve (flow-path switching device), 16 ... Refrigerant bypass passage 17, 17B ... Condenser (2nd capacitor)
17A ... sub capacitor (second capacitor), 20 ... engine (heating device)
21 ... Radiator (heating device, first radiator)
DESCRIPTION OF SYMBOLS 22, 23 ... Three-way valve (flow-path switching apparatus) 24 ... Cooling water bypass passage 25 ... Sub radiator (2nd radiator), 100 ... Control apparatus, 102 ... Cooling water circuit

Claims (12)

A pressure drop suppression device related to a refrigeration cycle (1; 301) constituting a refrigerant circuit that is mounted on a vehicle and circulates refrigerant,
A compressor (10) for discharging the sucked refrigerant at an increased pressure;
A first condenser (11) through which the refrigerant discharged by the compressor flows and the refrigerant and the outside air exchange heat;
A decompression device (12) for decompressing the refrigerant flowing out of the first capacitor;
An evaporator (13) into which the refrigerant decompressed by the decompression device flows;
A refrigerant bypass passage (16) that connects a passage upstream of the first condenser and a passage downstream of the first condenser so that the refrigerant discharged from the compressor can bypass the first condenser;
A second capacitor (17; 17B) provided in the refrigerant bypass passage;
A heating device (20, 21) for heating the second capacitor;
A flow path switching device (14, 15) capable of switching the flow path so that the refrigerant discharged from the compressor is in a bypass state in which the refrigerant flows into the refrigerant bypass path;
A control device (100) for controlling the operation of the flow path switching device;
A pressure drop suppression device comprising: The heating device is configured by a radiator (21) that dissipates heat from the cooling water by exchanging heat between the outside air passing through and the cooling water of the engine (20) of the vehicle.
2. The pressure drop suppression device according to claim 1, wherein the second condenser (17) is installed downstream of the radiator in the flow direction of the outside air. The heating device is constituted by an engine (20) of the vehicle,
2. The pressure drop suppression device according to claim 1, wherein the second condenser (17 </ b> B) is disposed downstream of the engine with respect to a flow direction of the outside air. A pressure drop suppression device related to a refrigeration cycle (201) that constitutes a refrigerant circuit that is mounted on a vehicle and circulates refrigerant,
A compressor (10) for discharging the sucked refrigerant at an increased pressure;
A first condenser (11) through which the refrigerant discharged by the compressor flows and the refrigerant and the outside air exchange heat;
A decompression device (12) for decompressing the refrigerant flowing out of the first capacitor;
An evaporator (13) into which the refrigerant decompressed by the decompression device flows;
A refrigerant bypass passage (16) that connects a passage upstream of the first condenser and a passage downstream of the first condenser so that the refrigerant discharged from the compressor can bypass the first condenser;
A second capacitor (17A) provided in the refrigerant bypass passage;
A flow path switching device (14, 15) capable of switching the flow path so that the refrigerant discharged from the compressor is in a bypass state in which the refrigerant flows into the refrigerant bypass path;
A control device (100) for controlling the operation of the flow path switching device;
With
The second capacitor is a pressure drop suppressing device configured such that a heat exchange amount is smaller than that of the first capacitor. A pressure drop suppression device related to a refrigeration cycle (101) that constitutes a refrigerant circuit that is mounted on a vehicle and circulates refrigerant,
A compressor (10) for discharging the sucked refrigerant at an increased pressure;
A condenser (11) through which the refrigerant discharged by the compressor flows in and heat exchange between the refrigerant and the outside air;
A decompression device (12) for decompressing the refrigerant flowing out of the condenser;
An evaporator (13) into which the refrigerant decompressed by the decompression device flows;
In the cooling water circuit (102) through which the cooling water of the engine (20) of the vehicle circulates, the cooling water and the outside air are heat-exchanged to cool the cooling water, and downstream of the condenser in the flow direction of the outside air. A first radiator (21) installed on the side;
A cooling water bypass passage (24) connecting the passage on the upstream side and the passage on the downstream side of the first radiator so that the cooling water can bypass the first radiator;
A second radiator (25) provided in the cooling water bypass passage and installed upstream of the condenser in the flow direction of the outside air;
A flow path switching device (22, 23) capable of switching the flow path so that the cooling water enters a bypass state in which the cooling water flows into the cooling water bypass path;
A control device (100) for controlling the operation of the flow path switching device;
A pressure drop suppression device comprising:   The said control apparatus is a pressure fall suppression apparatus as described in any one of Claims 1-5 which switches the action | operation of the said flow-path switching apparatus to the said bypass state, when outside temperature is less than a threshold temperature.   6. The control device according to claim 1, wherein the control device switches the operation of the flow path switching device to the bypass state when a refrigerant pressure on a high pressure side in the refrigeration cycle is lower than a threshold pressure. The pressure drop suppression apparatus of description.   The control device further switches the operation of the flow path switching device to the bypass state when the operation state of the vehicle air conditioner (5) is an inside air mode in which air in the vehicle compartment is cooled by the evaporator. The pressure drop suppression device according to claim 6 or 7. A pressure drop suppression device related to a refrigeration cycle (101) that constitutes a refrigerant circuit that is mounted on a vehicle and circulates refrigerant,
A compressor (10) for discharging the sucked refrigerant at an increased pressure;
A condenser (11) through which the refrigerant discharged by the compressor flows in and heat exchange between the refrigerant and the outside air;
A decompression device (12) for decompressing the refrigerant flowing out of the condenser;
An evaporator (13) into which the refrigerant decompressed by the decompression device flows;
A heater device (4) provided at a position where the capacitor can be heated;
A control device (100) for switching the operation of the heater device between a heat generation state and a non-heat generation state;
A pressure drop suppression device comprising:   The pressure drop suppression device according to claim 9, wherein the control device switches the operation of the heater device from a non-heat generation state to a heat generation state when an outside air temperature is lower than a threshold temperature.   The pressure drop suppression device according to claim 9, wherein the control device switches the operation of the heater device from a non-heat generation state to a heat generation state when a refrigerant pressure on a high pressure side in the refrigeration cycle is lower than a threshold pressure.   The control device further switches the operation of the heater device from a non-heat generation state to a heat generation state when an operation state of the vehicle air conditioner (5) is an inside air mode in which air in a vehicle compartment is cooled by the evaporator. The pressure drop suppression apparatus of Claim 10 or Claim 11.

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